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Unit 1: Earth's Dimensions

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The lithosphere. solid layer of rock that forms the outer shell of the Earth ... the layer of water that rests on the lithosphere. it is mainly made up of the oceans ... – PowerPoint PPT presentation

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Title: Unit 1: Earth's Dimensions


1
Unit 1 Earth's Dimensions
  • Topic The Parts of the Earth

2
Objective 1
  • The Earths outer layers are made up of 3 parts
  • - Lithosphere or crust
  • - Hydrosphere or oceans
  • - Atmosphere or air/gas

3
The lithosphere
  • solid layer of rock that forms the outer shell of
    the Earth
  • 100 kilometers in thickness
  • upper portion is called the crust

4
Hydrosphere
  • the layer of water that rests on the lithosphere
  • it is mainly made up of the oceans
  • covers 70 of the Earth
  • It is very thinabout 3.8 kilometers in thickness

5
Atmosphere
  • shell of gases that surrounds the Earth
  • it is layered into four main zones
  • -Troposphere, Stratosphere, Mesosphere,
    Thermosphere
  • Troposphere Where we live!!
  • Nitrogen (78) Oxygen (21)

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The properties of the Earth
  • Topic The Layers of the Earth
  • The Layers of the Atmosphere

9
The Layers of the Earth
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Using The Reference Table
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Layers of the Atmosphere
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Using the Reference Table
15
Unit 1 Earths Dimensions
  • Topics Maps and Mapping
  • (Part I)

16
Objectives 1
  • Polaris is used to determine the latitude
  • The Lines run across and measure North to South
  • 0 is the equator
  • 90 is the North and South Pole
  • What happens to Polaris when you decrease in
    Latitude?

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Locating Polaris
  • Remember the rule
  • Polaris altitude is the same as the latitude you
    are standing on --OR--
  • Use Ursa Major (akaBig Dipper)
  • Use the two pointer stars that are on the ladel
  • Diagram it.

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Locating Polaris
Polaris
Ursa minor
Ursa major
21
Looking North in the Northern Hemisphere
22
Longitude
  • Earth rotates from west to east
  • Earth rotates 360 in 24 hours
  • Which is 15 /hr
  • 0 longitude is the Prime Meridian
  • It is located in Greenwich, England

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Longitude
  • How can this be helpful in navigation?
  • LOCAL NOON sun at the highest point where you
    are
  • Know the GMT (Greenwich Mean Time)
  • Multiply the difference by 15 /hr your present
    longitude
  • Practice It..

25
What is the latitude and longitude of point X?
X
Y
What is the latitude and longitude of point Y?
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